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    Relative performance of different strategies for wave attenuation by periodic structures

    85427.pdf (412.6Kb)
    Access Status
    Open access
    Authors
    McMahon, Darryl
    Date
    2017
    Type
    Conference Paper
    
    Metadata
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    Citation
    McMahon, D. 2017. Relative performance of different strategies for wave attenuation by periodic structures. In Acoustics 2017, 19 - 22 Nov 2017, Perth, Australia.
    Source Conference
    Acoustics 2017
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/85605
    Collection
    • Curtin Research Publications
    Abstract

    For a periodic structure of symmetric scatterers, such as a ribbed plate or cylinder, Bloch-Floquet waves (BFW) are well-known periodic structure waves (PSW). Conventional wisdom is to attenuate BFW propagation by re-flections, energy absorption or stopping bands. Recent theoretical results show that periodic structures with asymmetric scatterers do not lead to BFW, revealing more possibilities for noise reduction through these dif-ferent PSW. This paper compares the performance of reciprocal and nonreciprocal wave propagation as meth-ods for PSW attenuation. It is found that nonreciprocal wave propagation, such as could be realized with asymmetric metamaterial scatterers, could achieve significantly better attenuation with relatively small deviations from symmetric scatterer properties.

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